2015-08-06 07:22:21 +08:00
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/*
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* Copyright (c) 2015 Andrew Kelley
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*
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* This file is part of zig, which is MIT licensed.
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* See http://opensource.org/licenses/MIT
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*/
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#include "config.h"
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#include "util.hpp"
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2015-08-06 08:44:05 +08:00
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#include "list.hpp"
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2015-08-06 07:22:21 +08:00
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <stdint.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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struct Buf {
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int len;
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char ptr[0];
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};
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static Buf *alloc_buf(int size) {
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Buf *buf = (Buf *)allocate_nonzero<char>(sizeof(Buf) + size + 1);
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buf->len = size;
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buf->ptr[buf->len] = 0;
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return buf;
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}
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2015-08-06 08:44:05 +08:00
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/*
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static void fprint_buf(FILE *f, Buf *buf) {
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if (fwrite(buf->ptr, 1, buf->len, f))
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zig_panic("error writing: %s", strerror(errno));
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}
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*/
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2015-08-06 07:22:21 +08:00
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static int usage(char *arg0) {
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fprintf(stderr, "Usage: %s --output outfile code.zig\n"
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"Other options:\n"
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"--version print version number and exit\n"
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, arg0);
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return EXIT_FAILURE;
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}
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static struct Buf *fetch_file(FILE *f) {
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int fd = fileno(f);
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struct stat st;
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if (fstat(fd, &st))
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zig_panic("unable to stat file: %s", strerror(errno));
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off_t big_size = st.st_size;
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if (big_size > INT_MAX)
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zig_panic("file too big");
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int size = (int)big_size;
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Buf *buf = alloc_buf(size);
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size_t amt_read = fread(buf->ptr, 1, buf->len, f);
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if (amt_read != (size_t)buf->len)
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zig_panic("error reading: %s", strerror(errno));
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return buf;
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}
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2015-08-06 08:44:05 +08:00
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#define WHITESPACE \
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' ': \
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case '\t': \
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case '\n': \
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case '\f': \
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case '\r': \
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case 0xb
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#define DIGIT \
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'0': \
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case '1': \
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case '2': \
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case '3': \
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case '4': \
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case '5': \
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case '6': \
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case '7': \
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case '8': \
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case '9'
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#define ALPHA \
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'a': \
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case 'b': \
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case 'c': \
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case 'd': \
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case 'e': \
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case 'f': \
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case 'g': \
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case 'h': \
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case 'i': \
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case 'j': \
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case 'k': \
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case 'l': \
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case 'm': \
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case 'n': \
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case 'o': \
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case 'p': \
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case 'q': \
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case 'r': \
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case 's': \
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case 't': \
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case 'u': \
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case 'v': \
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case 'w': \
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case 'x': \
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case 'y': \
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case 'z': \
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case 'A': \
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case 'B': \
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case 'C': \
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case 'D': \
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case 'E': \
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case 'F': \
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case 'G': \
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case 'H': \
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case 'I': \
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case 'J': \
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case 'K': \
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case 'L': \
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case 'M': \
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case 'N': \
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case 'O': \
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case 'P': \
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case 'Q': \
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case 'R': \
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case 'S': \
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case 'T': \
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case 'U': \
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case 'V': \
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case 'W': \
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case 'X': \
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case 'Y': \
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case 'Z'
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enum TokenId {
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TokenIdDirective,
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TokenIdSymbol,
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TokenIdLParen,
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TokenIdRParen,
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TokenIdComma,
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TokenIdStar,
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TokenIdLBrace,
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TokenIdRBrace,
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TokenIdStringLiteral,
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TokenIdSemicolon,
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TokenIdNumberLiteral,
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TokenIdPlus,
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};
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struct Token {
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TokenId id;
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int start_pos;
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int end_pos;
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};
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enum TokenizeState {
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TokenizeStateStart,
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TokenizeStateDirective,
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TokenizeStateSymbol,
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TokenizeStateString,
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TokenizeStateNumber,
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};
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struct Tokenize {
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int pos;
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TokenizeState state;
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ZigList<Token> *tokens;
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int line;
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int column;
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Token *cur_tok;
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};
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__attribute__ ((format (printf, 2, 3)))
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static void tokenize_error(Tokenize *t, const char *format, ...) {
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va_list ap;
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va_start(ap, format);
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fprintf(stderr, "Error. Line %d, column %d: ", t->line + 1, t->column + 1);
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vfprintf(stderr, format, ap);
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va_end(ap);
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exit(EXIT_FAILURE);
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}
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static void begin_token(Tokenize *t, TokenId id) {
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assert(!t->cur_tok);
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t->tokens->add_one();
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Token *token = &t->tokens->last();
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token->id = id;
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token->start_pos = t->pos;
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t->cur_tok = token;
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}
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static void end_token(Tokenize *t) {
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assert(t->cur_tok);
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t->cur_tok->end_pos = t->pos + 1;
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t->cur_tok = nullptr;
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}
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static void put_back(Tokenize *t, int count) {
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t->pos -= count;
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}
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static ZigList<Token> *tokenize(Buf *buf) {
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Tokenize t = {0};
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t.tokens = allocate<ZigList<Token>>(1);
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for (t.pos = 0; t.pos < buf->len; t.pos += 1) {
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uint8_t c = buf->ptr[t.pos];
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switch (t.state) {
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case TokenizeStateStart:
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switch (c) {
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case WHITESPACE:
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break;
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case ALPHA:
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t.state = TokenizeStateSymbol;
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begin_token(&t, TokenIdSymbol);
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break;
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case DIGIT:
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t.state = TokenizeStateNumber;
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begin_token(&t, TokenIdNumberLiteral);
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break;
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case '#':
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t.state = TokenizeStateDirective;
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begin_token(&t, TokenIdDirective);
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break;
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case '(':
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begin_token(&t, TokenIdLParen);
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end_token(&t);
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break;
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case ')':
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begin_token(&t, TokenIdLParen);
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end_token(&t);
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break;
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case ',':
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begin_token(&t, TokenIdComma);
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end_token(&t);
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break;
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case '*':
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begin_token(&t, TokenIdStar);
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end_token(&t);
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break;
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case '{':
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begin_token(&t, TokenIdLBrace);
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end_token(&t);
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break;
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case '}':
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begin_token(&t, TokenIdRBrace);
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end_token(&t);
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break;
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case '"':
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begin_token(&t, TokenIdStringLiteral);
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t.state = TokenizeStateString;
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break;
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case ';':
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begin_token(&t, TokenIdSemicolon);
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end_token(&t);
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break;
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case '+':
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begin_token(&t, TokenIdPlus);
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end_token(&t);
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break;
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default:
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tokenize_error(&t, "invalid character: '%c'", c);
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}
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break;
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case TokenizeStateDirective:
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if (c == '\n') {
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assert(t.cur_tok);
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t.cur_tok->end_pos = t.pos;
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t.cur_tok = nullptr;
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t.state = TokenizeStateStart;
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}
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break;
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case TokenizeStateSymbol:
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switch (c) {
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case ALPHA:
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case DIGIT:
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case '_':
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break;
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default:
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put_back(&t, 1);
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end_token(&t);
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t.state = TokenizeStateStart;
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break;
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}
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break;
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case TokenizeStateString:
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switch (c) {
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case '"':
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end_token(&t);
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t.state = TokenizeStateStart;
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break;
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default:
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break;
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}
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break;
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case TokenizeStateNumber:
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switch (c) {
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case DIGIT:
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break;
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default:
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put_back(&t, 1);
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end_token(&t);
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t.state = TokenizeStateStart;
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break;
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}
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break;
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}
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if (c == '\n') {
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t.line += 1;
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t.column = 0;
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} else {
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t.column += 1;
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}
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}
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return t.tokens;
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}
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static const char * token_name(Token *token) {
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switch (token->id) {
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case TokenIdDirective: return "Directive";
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case TokenIdSymbol: return "Symbol";
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case TokenIdLParen: return "LParen";
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case TokenIdRParen: return "RParen";
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case TokenIdComma: return "Comma";
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case TokenIdStar: return "Star";
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case TokenIdLBrace: return "LBrace";
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case TokenIdRBrace: return "RBrace";
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case TokenIdStringLiteral: return "StringLiteral";
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case TokenIdSemicolon: return "Semicolon";
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case TokenIdNumberLiteral: return "NumberLiteral";
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case TokenIdPlus: return "Plus";
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}
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return "(invalid token)";
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}
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static void print_tokens(Buf *buf, ZigList<Token> *tokens) {
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for (int i = 0; i < tokens->length; i += 1) {
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Token *token = &tokens->at(i);
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printf("%s ", token_name(token));
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fwrite(buf->ptr + token->start_pos, 1, token->end_pos - token->start_pos, stdout);
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printf("\n");
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}
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}
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2015-08-06 07:22:21 +08:00
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int main(int argc, char **argv) {
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char *arg0 = argv[0];
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char *in_file = NULL;
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char *out_file = NULL;
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for (int i = 1; i < argc; i += 1) {
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char *arg = argv[i];
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if (arg[0] == '-' && arg[1] == '-') {
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if (strcmp(arg, "--version") == 0) {
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printf("%s\n", ZIG_VERSION_STRING);
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return EXIT_SUCCESS;
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} else if (i + 1 >= argc) {
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return usage(arg0);
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} else {
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i += 1;
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if (strcmp(arg, "--output") == 0) {
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out_file = argv[i];
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} else {
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return usage(arg0);
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}
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}
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} else if (!in_file) {
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in_file = arg;
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} else {
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return usage(arg0);
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}
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}
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if (!in_file || !out_file)
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return usage(arg0);
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FILE *in_f;
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if (strcmp(in_file, "-") == 0) {
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in_f = stdin;
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} else {
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in_f = fopen(in_file, "rb");
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if (!in_f)
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zig_panic("unable to open %s for reading: %s\n", in_file, strerror(errno));
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}
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struct Buf *in_data = fetch_file(in_f);
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fprintf(stderr, "%s\n", in_data->ptr);
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2015-08-06 08:44:05 +08:00
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ZigList<Token> *tokens = tokenize(in_data);
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print_tokens(in_data, tokens);
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2015-08-06 07:22:21 +08:00
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return EXIT_SUCCESS;
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}
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